migration
- n. 迁移；移民；移动
英英释意
- 1. the movement of persons from one country or locality to another
- 2. a group of people migrating together (especially in some given time period)
- 3. (chemistry) the nonrandom movement of an atom or radical from one place to another within a molecule
- 4. the periodic passage of groups of animals (especially birds or fishes) from one region to another for feeding or breeding